<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div span{
            background-color: aqua;
        }
        div h1{
            color: bisque;
        }
    </style>
</head>
<body>
    <div>
       <span>div son</span>
    </div>
    <div>
        <p>
            <span>div di son</span>
        </p>
    </div>
    <div>
        <h1>xxx</h1>
    </div>
    <h1>aaa</h1>
</body>
</html>